<template>
  <div>
    <!-- 头部导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item :to="{ path: '/goods'}">商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片区域 -->
    <el-card>
      <!-- 警告 -->
      <el-alert :space="200" title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
      <!-- 步骤条 -->
      <el-steps :active="activeindex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab栏 -->
      <el-form :model="addForm" :rules="addRules" ref="addFormRef" label-width="100px" label-position="top"> 
      <el-tabs v-model="activeindex" :tab-position="'left'"
      :before-leave="beforeTabLeave" @tab-click="tabClicked()">
        <!-- 基本信息 -->
        <el-tab-pane label="基本信息" name="0">
          <el-form-item label="商品名称" prop="goods_name">
            <el-input v-model="addForm.goods_name"></el-input>
          </el-form-item>
          <el-form-item label="商品价格" prop="goods_price">
            <el-input v-model="addForm.goods_price" type="number"></el-input>
          </el-form-item>
          <el-form-item label="商品重量" prop="goods_weight">
            <el-input v-model="addForm.goods_weight" type="number"></el-input>
          </el-form-item>
          <el-form-item label="商品数量" prop="goods_number">
            <el-input v-model="addForm.goods_number" type="number"></el-input>
          </el-form-item>
          <el-form-item label="商品分类" prop="goods_cat">
            <el-cascader v-model="addForm.goods_cat" :options="cateList" :props="cateProps" 
            @change="handleChange"></el-cascader>
          </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品参数" name="1"></el-tab-pane>
        <el-tab-pane label="商品属性" name="2">商品属性</el-tab-pane>
        <el-tab-pane label="商品图片" name="3">商品图片</el-tab-pane>
        <el-tab-pane label="商品内容" name="4">商品内容</el-tab-pane>
      </el-tabs>
      </el-form>
    </el-card>
  </div>  
</template>

<script>
export default {
  data() {
    return {
      activeindex: '0',
      // 添加的商品
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: ''


      },
      addRules: {
        goods_name: [
          { required: true,message: "请输入商品名称",trigger: 'blur'}
        ],
        goods_price: [
          { required: true,message: "请输入商品价格",trigger: 'blur'}
        ],
        goods_weight: [
          { required: true,message: "请输入商品重量",trigger: 'blur'}
        ],
        goods_number: [
          { required: true,message: "请输入商品数量",trigger: 'blur'}
        ],
        goods_cat: [
          { required: true,message: "请输入商品分类",trigger: 'blur'}
        ],
      },
      // 商品列表
      cateList: [],
      // 级联选择器
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children',
        expandTrigger: 'hover'
      },
      // 动态参数列表
      manyTableData: []
    }
  },
  created() {
    this.getCateList()
  }, 
  methods: {
    // 获取商品列表
    async getCateList() {
      const {data:res} = await this.$http.get('categories')
      if(res.meta.status !== 200) {
        return this.$message.error('获取列表失败！')
      }
      this.$message.success('获取列表成功！')
      this.cateList = res.data
    },
    // 级联选择
    handleChange() {
      if(this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    // 切换tab栏
    beforeTabLeave(activeName, oldActiveName){
      
      if(oldActiveName === '0' && 
      this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类！')
        return false
      }
      
    },
    // 点击tab
   async tabClicked() {
      if(this.activeindex === '1' ) {
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,
        { params: { sel : 'many' } }
        )
        if(res.meta.status !== 200) {
          return this.$message.error('获取动态参数失败')
        }
        this.manyTableData = res.data
        this.$message.success('获取动态参数成功')
      }
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length == 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    },
  }
}
</script>

<style>
.el-card {
  margin-top: 15px;
}
.el-steps {
  margin: 15px 0;
}
.el-step__title {
  font-size: 13px;
}
</style>